Hi, My Mac Mini arrived this morning, 1.42 with 256MB RAM, its the first time Ive ever bought a Mac, OS X does seem very good, however after using it for a while the screen keeps going blank, well blue for a few seconds, fist this happened during minimizing/ maximizing of windows, during the animation, or playing dvds, but it seems to happen all the time now, moving the mouse, navigating finder or typing in word, its really annoying, can someone please help. Could it be that 256MB of ram is just not enough?